Abstract:
:This study evaluated the effect of angled insertion of halo pins on the biomechanical characteristics of the halo pin-calvarium complex. Halo pins were inserted into isolated calvarium sections at 90 degrees, 75 degrees, and 60 degrees to the surface of the bone at an insertional torque of 0.68 N-m (6 inch-pounds). Initial rigidity, load at failure, and deformation at failure of the pin-bone complex were assessed during transverse shear loading. The structural properties of the pin-bone complex were maximized at loads approaching failure when pins were inserted perpendicular (90 degrees) to the bony surface and significantly decreased at more acute angles of insertion. Perpendicular insertion of halo pins maximizes the structural properties of the complex formed by the halo pin and the calvarium. This improved structural behavior may minimize the incidence of pin loosening clinically, and may reduce the frequency of other complications currently associated with the use of the halo orthosis.
journal_name
Spine (Phila Pa 1976)journal_title
Spineauthors
Triggs KJ,Ballock RT,Lee TQ,Woo SL,Garfin SRdoi
10.1097/00007632-198908000-00001subject
Has Abstractpub_date
1989-08-01 00:00:00pages
781-3issue
8eissn
0362-2436issn
1528-1159journal_volume
14pub_type
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